Rotatable electromagnetic clutch.



F. SATTERSTROM.

HOTATABLE ELECTROMAGNETIC CLUTCH.

APPLICATION FILED MAR. 2o. 1917.

1 ,273,003. Patented July 16, 1918.

Immun.-

Il lllll! WML B WWI W /YEYJ' 2o nism capable of operating at high speed and FEBDENAND SVATTERSTROM, OFA'HASTING'S, MINNESUTA, ASSIGNOR TO GNETIC POWER TRANSMITTER COMPANY, 0F FARIIBAULT, MNNESOTA; A. CORPGRATIQN 0F MINNESOT..

aerzte.

' Specification of Letters Patent.

Patented July 16, 1918.

Application led March 20, 1917. Serial No. 155,974;

To all whom z't'may concern.'

Be it known that I, FERDINAND SATTER- sTRoM, a citizen of the United States, resident of Hastings, county of Dakota, State of Minnesota, have invented certain new and a magnetically controlled clutch deviceA through which power may be easily and quickly transmitted intermittently to an operating mechanism which can be readily adaptedfor avariety of purposes.

A further object is to provide a mechanism of the class described which is capable of performing its functions without the jar or shock frequently incidental to the starting and stoppage of clutch control devices.

A further object is to provide a mechawith great accuracy.

Other objects of the invention will appear from thel following detailed description.

The invention consists generally in various constructions and combinations, all as hereinafter described and particularly pointed out in the claims.

In the accompanying drawings forming part of this specification,

n Figure 1 is a front vew of the magnetic clutch, shown partly in section.

Fig. 2 is an end View of the same.

Fig. 3 is a detail cross sectional View of the opposite end from that shown in Fig. 2.

Fig. 4 is another detail sectional view.

Fig. 5 is a rear view of same.

In the drawing, 2 represents a base upon which l mount a suitable electric motor 3. The motor is provided with a shaft 4 having secured thereon a soft metal sleeve or armature 5 rotating therewith. Said motor is connected with a suitable source of electric energy by suitable conductors (not shown).

While I prefer to employ an electric motor for rotating the shaft 4 I do notlimit myself thereto as any suitable motor that may be continuously operated. at a uniform speed to continuously rotate ashaft may be em loyed.-

rranged above the shaft 4 and parallelY and in close roximit .thereto is a rotatable magnet 6, anv when t 1s magnet is energized it moves against and is clutched to the rotating shaft armature, and is caused to rotate therewith to the extent of one complete revolution. The magnet is mounted upon a freely rotating shaft 7 which is provided with a gear 7, or any other suitable means for transmitting power from said shaft 7. As here shown the base 2 is provided with a bracket 8 having standards 9 and 10. Pivoted to the upper ends of these standards is a bar 11 which carries the laterally pr0jecting heads 12. These heads are circular in form and they provide bearings for the shaft 7. rlhe magnet 6 is preferably formed of a metal spool 18, mounted upon the shaft 7, and having a suitable conducting coil 14 wound thereon. The bar 11 is provided with a tail-piece 15 to which a spring 16 is connected. This sprin has its opposite end connected to the stan ard 9 and tends to rock the bar 11 on its pivot and thereby to raise the magnet from the shaft armature 5. The disk 17 on the end of the shaft 7 has a notch 18 in its periphery and a pivoted `dog 19 is provided having a lug 20 adapted to engage said recess 1S. To insure the lug 20 engaging the recess 18 and not jumping over the same, l prefer to cut down the edge of the disk on the side of the notch 18 over which the lug 20 passes as it enters said notch. A spring 21 is connected to the do 19 and to a pin 22. .This pin tends to ho d the dog snugly against the edge of the crank disk so as to insure the lug 20A entering the notch in the edge of the crank disk. For increasing and decreasing the tensions of the spring 21, I provide preferably special means hereinafter described.

I also provide on the shaft 7 a cam 23, the edge of which is in the form of a radially extending lug. A block 24 is pivoted on a suitable support and this block has an upward extension 25, which projects into the plane of the cam 23, and is engaged by said cam, which action rocks the block 24 upon vits pivotal support. The block 24 carries the insulated contact springs 26 and 27 as shown in Fig. 3 of the drawings. An insulating block 28 is mounted on ya bar 11 and carries a contact spring 29 that is in contact with the insulated ring 30 on one end of the rotatable magnet G (see Figs. 1 and 3). is ring is connected to the conductor 14 of the magnet. The other end of said conductor is grounded to the spool 13.`

The insulating block 28 has preferably a recess extending through it with a contact screw 31, projecting through one wall of the recess, and a contact point 32 on the opposite wall is connected with the spring 29. The

' 'jection on the block 24 is not engaged by the tromagnet 37 is mounted in these rent through the rotatable ma cam 23 the end of the contact spring 26 is out of contact'v with the end of the screw 31, and the end of the contact spring 27 is in engagement Awith the contact point 32 on the spring 29, as illustrated in Fig. 2. rlhe spring 33 is mounted on the bracket 8, and this spring engages a heel orlug 34, provided in the'block 24, thereby tending to rock the block 24 so as to hold the contact spring 27 at all times in engagement with the contact point 32, while permitting it to be moved away when the cam projection 23 passes the upwardly extending projection on the block 24. i

Secured to the block 11 is a plate 35 carrying a pair of small hangers 36, and an elechangers (see Fig. 5). magnet 1s secured upon a small rock shaft 39. The dog 19 is loosely mounted upon this shaft 39 and a pin 22 is inserted in the shaft 39 and extends through a slot in the hub of the dog 19 (see Fig. 2). To the end of the pin 22 is connected a spring 21 which is also connected to the dog 19. The lug 20 on thek dog 19 rides on the edge of the cam disk 1-7, while the current is passing through the rotatable magnet.- When the projection 23 engages the upwardly extending projection 25 on the block 24 the shaft 39 is rocked to bring the armature 38 closer to the magnet 37, also putting the spring 21 under tension, and also breaking the curet and as the spring 26 engages the end o the contact screw 31 the current is passed through the magnet 37 by means of the conductor 40. This 'causes the ,armature 38 to be drawn toward the magnet 37, rocking the'v shaft 39 farther upon its axis and -moving`l thepin 22 with said shaft, therebyy further increasing the tension of the spring 21. This occurs just the instant before the projection 20 on the dog 19 comes opposite the recess 18 in the edge of the cam disk 17 ,thereby causing said lug to be quickly and firmly drawn into said recess and positively stopping movement of the magnet. The posi- An armature 38 for this Laramie tion of the cam 23 in relation to the disk .17 can be changed so as to allow proper time for the momentum of the magnet 6 and the notch in its disk to be engaged by the dog 19 and stopped.

rihe purpose of this is to prevent any over-run of the rotating magnet after the circuit is broken and the,magnet has been demagnetized. As the magnet rotates very rapidly it might slightly over-run if this positive stop was not provided.

Circuit for the magnet clutch.

By referring to Fig. 3 of the drawings the path of the electric current for. energizing the rotating magnet and the magnet which applies the positive stop to said rotating magnet may be readily traced. As here shown conductor 41 extends from the battery 42 to the insulated block 43, secured upon the rocking block 24 and electrically connected with the contact springs 26 and 27. Normally the spring 27 is in contact with the contact point 32 on the contact spring 29, sov that when the switch 44 is either manually or automatically closed the rotatable magnet is energized, the path of the current being in this instance from the battery 42 through the conductor 41, the' spring 27 and the spring 2,9 to the insulatedV ring 30, thence to the coils of the magnet to a ground conductor 45. As the rotatable magnet approaches the end of a sin le revolution the contact spring 26 is move against the end of thecontact screw 31, and the spring 27 is moved away from the contact point 32. The current is now switched 0H" from the rotatable magnet and through the small magnet 37. As this magnet is energized its armature 38 is drawn toward it and the shaft 39 is rocked thereby insuring the engagement of the lug 20 on the dog 19 with the recess 18 in the disk 17, and positively stopping the rotatable magnet at the right point. he circuit for this magnet 37 is through battery 42, spring 26, contact screw 31, and conductor 40 to magnet, thence to the ground conductor 45 and switch 44 to battery. When the switch 44 is opened the circuit, through the magnet 37 is broken and the parts are returned. to their normal position ready for the next operation.

As the shaft 39 is rocked back to its normal position the tension on the spring 21 is released and the do 19 is restored to its normal position indicated ink Fig. 2, with itslug 20 out of engagement with the re'- cess 18 in the disk 17. The rotatable armature, therefore, is free to move again as soon as a current is passed through its coils, and it is again energized and clutchedjo the constantly running shaft armature.

It' will be seen, therefore, that each time the switch is closed the rotatable magnet will be energized and clutched to the con- 'starting again. This will hold the dog 19 in engagement with the disk 17, and keep the magnet 6 locked, but by throwing the switch off and on again the Vaforesaid circuit will be broken, themagnet 6 released and the circuit made throu h said magnet and caused to clutch the ring armature 5 and revolve therewith -to the extent of one revolution when its current will be broken and the circuit again made through the'magnet 37 and ysprin 36 to lock and hold the magnet 6 yuntil the next operation of theA switch.

I do not limit myself to the details of construction herein shown and described, as the same may be varied in many particulars Without departing from my invention.

I claim as my invention:

1. A device of the class described, comprising a relatively revoluble magnet` and armature, said magnet being movable toward and from the armature and having an electric circuit and a circuit maker and breaker, a driven member operated by said magnet, and means for operating said circuit maker and breaker. r

2. A device of the class described, comprising, `in combination a revoluble armature, means for revolving said armature, a revoluble magnet mounted V.in proximity to said armature and movable toward and from the armature, means for energizing and de-k armature, and a driven member connected with said magnet to be driven therefrom.

V3. A device of the class described com' prising a driving shaft, an armature mountedl thereon, an electromagnet adjacent to said armature mounted for relative revolution, an electric circuit for energizing said magnet, a driven member connected with said magnet, and a devicefzfor alternately releasing and locking said magnet.

4'. A device of the class described comprising a driving shaft, a cylindrical arma- `ture therefor, an electromagnet, said magnet andI armature mounted for relative revolution, an electric'circuit for said magnet, a circuit closer therefor, a driven member connected with said magnet and a device vfor releasing and stopping said magnet.

5. A device of the class described comprising a driving shaft, a cylindrical armature therefor, an electromagnet mounted for attraction tosaid armature to be revolved thereby, an electric'circuit for said magnet, a circuit closer therefor, a; member driven from said magnet and a device for releasing and stopping said magnet.

6. A device of the class described, comprising a revolving magnet and an armature for revolving thel same, an electric circuit and circuit closer for said magnet, a

member having a ,driving connection with,

said magnet, a locking means for said magnet having a trip for releasing said magnet, anda magnet having a circuit and an armature connected with. said locking means for checking said revolving magnet at the end of each revolution.

In witness whereof, I have hereunto set my hand'this 12th day of March, 1917.

FERDINAND SA'ITERSTRGM. 

